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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

778
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
778
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

594
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
594

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Related Experiment Video

Updated: Oct 19, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Raman Spectroscopy for the Analysis of Microplastics in Aquatic Systems.

Veronica Nava1, Maria Luce Frezzotti1, Barbara Leoni1

  • 1Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy.

Applied Spectroscopy
|September 20, 2021
PubMed
Summary

Raman spectroscopy is a powerful tool for analyzing microplastics in aquatic environments. This study provides a comprehensive guide and a new R package to improve microplastic identification, addressing challenges like fluorescence and additives.

Keywords:
Analytical methodsRaman microspectroscopymicroplastic characterizationplastic additivespolymer identificationspectral library

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Microplastics are a growing concern in aquatic systems, with small particles being numerically abundant.
  • Raman spectroscopy offers high spatial resolution for analyzing these microplastics.
  • Challenges exist in Raman spectroscopy, including fluorescence interference and the analysis of weathered polymers.

Purpose of the Study:

  • To outline the current status of Raman spectroscopy for microplastic analysis in aquatic systems.
  • To highlight the advantages and disadvantages of Raman spectroscopy for microplastic identification.
  • To provide practical guidance and resources for improving spectral interpretation and analysis.

Main Methods:

  • Summarized procedural information for using Raman spectroscopy.
  • Discussed issues related to fluorescence interference and weathered polymers.
  • Developed a comprehensive catalog of Raman peaks for common plastic polymers and additives.

Main Results:

  • Presented a catalog of Raman peaks for common plastic polymers, serving as a novel resource.
  • Detailed the impact of plastic additives on Raman spectral identification.
  • Introduced a new R package, "RamanMP," containing 356 spectra (325 additives) to aid analysis.

Conclusions:

  • Raman spectroscopy is a valuable technique for microplastic analysis, but requires careful interpretation.
  • A thorough understanding of polymer and additive Raman signatures is crucial for accurate identification.
  • The "RamanMP" package and spectral catalog aim to enhance the reliability and accessibility of microplastic analysis using Raman spectroscopy.